Self-ordered nanospike porous alumina fabricated under a new regime by an anodizing process in alkaline media

Abstract High-aspect ratio ordered nanomaterial arrays exhibit several unique physicochemical and optical properties. Porous anodic aluminum oxide (AAO) is one of the most typical ordered porous structures and can be easily fabricated by applying an electrochemical anodizing process to Al. However,...

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Autores principales:	Mana Iwai, Tatsuya Kikuchi, Ryosuke O. Suzuki
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/7cc1e7683292457fac19498ad88a6f32
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spelling	oai:doaj.org-article:7cc1e7683292457fac19498ad88a6f322021-12-02T13:26:58ZSelf-ordered nanospike porous alumina fabricated under a new regime by an anodizing process in alkaline media10.1038/s41598-021-86696-z2045-2322https://doaj.org/article/7cc1e7683292457fac19498ad88a6f322021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-86696-zhttps://doaj.org/toc/2045-2322Abstract High-aspect ratio ordered nanomaterial arrays exhibit several unique physicochemical and optical properties. Porous anodic aluminum oxide (AAO) is one of the most typical ordered porous structures and can be easily fabricated by applying an electrochemical anodizing process to Al. However, the dimensional and structural controllability of conventional porous AAOs is limited to a narrow range because there are only a few electrolytes that work in this process. Here, we provide a novel anodizing method using an alkaline electrolyte, sodium tetraborate (Na2B4O7), for the fabrication of a high-aspect ratio, self-ordered nanospike porous AAO structure. This self-ordered porous AAO structure possesses a wide range of the interpore distance under a new anodizing regime, and highly ordered porous AAO structures can be fabricated using pre-nanotexturing of Al. The vertical pore walls of porous AAOs have unique nanospikes measuring several tens of nanometers in periodicity, and we demonstrate that AAO can be used as a template for the fabrication of nanomaterials with a large surface area. We also reveal that stable anodizing without the occurrence of oxide burning and the subsequent formation of uniform self-ordered AAO structures can be achieved on complicated three-dimensional substrates.Mana IwaiTatsuya KikuchiRyosuke O. SuzukiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Mana Iwai Tatsuya Kikuchi Ryosuke O. Suzuki Self-ordered nanospike porous alumina fabricated under a new regime by an anodizing process in alkaline media
description	Abstract High-aspect ratio ordered nanomaterial arrays exhibit several unique physicochemical and optical properties. Porous anodic aluminum oxide (AAO) is one of the most typical ordered porous structures and can be easily fabricated by applying an electrochemical anodizing process to Al. However, the dimensional and structural controllability of conventional porous AAOs is limited to a narrow range because there are only a few electrolytes that work in this process. Here, we provide a novel anodizing method using an alkaline electrolyte, sodium tetraborate (Na2B4O7), for the fabrication of a high-aspect ratio, self-ordered nanospike porous AAO structure. This self-ordered porous AAO structure possesses a wide range of the interpore distance under a new anodizing regime, and highly ordered porous AAO structures can be fabricated using pre-nanotexturing of Al. The vertical pore walls of porous AAOs have unique nanospikes measuring several tens of nanometers in periodicity, and we demonstrate that AAO can be used as a template for the fabrication of nanomaterials with a large surface area. We also reveal that stable anodizing without the occurrence of oxide burning and the subsequent formation of uniform self-ordered AAO structures can be achieved on complicated three-dimensional substrates.
format	article
author	Mana Iwai Tatsuya Kikuchi Ryosuke O. Suzuki
author_facet	Mana Iwai Tatsuya Kikuchi Ryosuke O. Suzuki
author_sort	Mana Iwai
title	Self-ordered nanospike porous alumina fabricated under a new regime by an anodizing process in alkaline media
title_short	Self-ordered nanospike porous alumina fabricated under a new regime by an anodizing process in alkaline media
title_full	Self-ordered nanospike porous alumina fabricated under a new regime by an anodizing process in alkaline media
title_fullStr	Self-ordered nanospike porous alumina fabricated under a new regime by an anodizing process in alkaline media
title_full_unstemmed	Self-ordered nanospike porous alumina fabricated under a new regime by an anodizing process in alkaline media
title_sort	self-ordered nanospike porous alumina fabricated under a new regime by an anodizing process in alkaline media
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/7cc1e7683292457fac19498ad88a6f32
work_keys_str_mv	AT manaiwai selforderednanospikeporousaluminafabricatedunderanewregimebyananodizingprocessinalkalinemedia AT tatsuyakikuchi selforderednanospikeporousaluminafabricatedunderanewregimebyananodizingprocessinalkalinemedia AT ryosukeosuzuki selforderednanospikeporousaluminafabricatedunderanewregimebyananodizingprocessinalkalinemedia
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Self-ordered nanospike porous alumina fabricated under a new regime by an anodizing process in alkaline media

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